Limitations such as "8192x8192" usually come from OpenGL. The GPU/driver
will define a maximum resolution for any texture it supports, usually a
power of 2, so that looks like it.

In theory a shell or display server should implement extra logic to work
around that limitation, but it's still pretty common for them to not
(yet) support it.

I've never heard of xrandr making the complaint though. I would expect
to hear it from the compositor only. Can you please try logging into
"Ubuntu on Wayland" instead? Does that work better?

** Also affects: mutter (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: mutter (Ubuntu)
       Status: New => Incomplete

** Changed in: xorg-server (Ubuntu)
       Status: New => Incomplete

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  Can't use three monitors properly; "xrandr: screen cannot be larger
  than 8192x8192"

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